protobuf.js/tests/data/enum-semantics.proto

edition = "2023";

message OpenMessage {
    enum OpenEnum {
        ZERO = 0;
        ONE = 1;
    }

    OpenEnum singular = 1;
    repeated OpenEnum repeated = 2 [features.repeated_field_encoding = EXPANDED];
    repeated OpenEnum packed = 3 [features.repeated_field_encoding = PACKED];
    map<string, OpenEnum> values = 4;
}

message ClosedMessage {
    option features.enum_type = CLOSED;

    enum ClosedEnum {
        ZERO = 0;
        ONE = 1;
    }

    ClosedEnum singular = 1;
    repeated ClosedEnum repeated = 2 [features.repeated_field_encoding = EXPANDED];
    repeated ClosedEnum packed = 3 [features.repeated_field_encoding = PACKED];
    map<string, ClosedEnum> values = 4;
}

message ClosedImplicitMessage {
    option features.enum_type = CLOSED;
    option features.field_presence = IMPLICIT;

    enum ClosedEnum {
        ZERO = 0;
        ONE = 1;
    }

    ClosedEnum singular = 1;
}